#include <stdio.h>
#include <stdlib.h>

typedef struct node* link;

struct node
{
  int item;
  link next;
};

int main(int argc, char *argv[]) 
{
  int i, N = atoi(argv[1]), M = atoi(argv[2]);
  link t = malloc(sizeof *t), x = t;

  t->item = 1; t->next = t;
  for (i = 2; i <= N; i++)
    {
      x = (x->next = malloc(sizeof *x));
      x->item = i;
      x->next = t;
    }
  while (x != x->next)
    {
      for (i = 1; i < M; i++)
	x = x->next;
      x->next = x->next->next;
      N--;
    }
  printf("%d\n", x->item);
  return 0;
}
